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TPS43061: Boost controller suggestion with disconnection FET

Ella KIM
Expert 3412 points
Part Number: TPS43061
Other Parts Discussed in Thread: LM5121, LM5122, LM5176, LM5177, LM5050-1

Hi Team,

I'm looking for a boost controller for 18~30VIN to 32~53VOUT (500W). Looks TPS43061 is cost-effective, small size, and simple to implement. Can you suggest the best fit device other than TPS43061?

In addition, one concern is the pass thru mode; VIN will be reflected to VOUT. Can you also suggest the latest device with disconnection FET? LM5121 looks good but I'm wondering if TI has an updated roadmap. 

Thanks a lot!

  • +1
    TI__Mastermind 31511 points

    Hi Ella,

    the device will fit but it might get hard to find a FET which can handle this power. So you need to go with two FETs in parallel or even an Multistage design.

    Another option would be the LM5122.

    The LM5121 but also a BuckBoost Controller like the LM5176 ort LM5177 can be used if disconnect feature is required.

    Best regards,

     Stefan

  • 0 in reply to Stefan Schauer
    TI__Expert 3412 points

    Hi Stefan,

    Thank you for comment! I can suggest LM5177 but it might be over-cost to use only for boost.

    I'm wondering LM5121/5122 + switch would work here. I search an ideal diode controller LM5050-1, but it looks the direction of FET is not proper for disconnection switch. Can you suggest a simple disconnection switch controller? Please help invite Power Switch folk. 

  • 0 in reply to Ella KIM
    TI__Mastermind 31511 points

    Hi Ella,

    sorry I am not in the product group and do not have the right contact for the disconnect switch controller  or ideal diode controller.

    You may open another thread for that question so that i can get assigned to that team.

    Best regards,

     Stefan

  • 0 in reply to Stefan Schauer
    TI__Expert 3412 points

    Hi Stefan,

    Customer wants to simulate the efficiency 12V to 28V (500W) or 24V to 48V (500W).

    1. May I ask why there's a limitation on Iout for LM5121 Webench design? As it's a controller, I thought it would be able to drive all power watt as long as FETs are selected correctly.

    It goes similar to TPS43061. There's a limitation of 100A.

    2.  Beside the Iout limitation in Webench simulation, I notice that I cannot get the efficiency data in Webench anyway as below. Please let me know if you have an idea to estimate the efficiency/thermal before customer decides whether two devices are a proper solution or not.

    3. I notice LM5122 Webench simulation works. LM5122 and LM5121 are basically the same device with several differences (disconnection FET and multiphase capability)? Can I consider that the effi of LM5121 would be similar to LM5122?

  • 0 in reply to Ella KIM
    TI__Mastermind 31511 points

    Hi Ella,

    Webench uses a database of components and tries to make a design out of these.

    I do not know all the internals of Webench but how should the system make an useful efficiency calculation if one of the most contributing elements is an ideal component.  Maybe that is the reason why they do not process this.

    Best regards,

     Stefan